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main: add assertions for timespec signedness

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Some of the code (e.g. util and clientlog) may work with negative
values. Require that time_t and the tv_nsec types are signed. This seems
to be the case on all supported systems, but it it is not required by
POSIX.
This commit is contained in:
Miroslav Lichvar 2021-11-23 14:41:08 +01:00
parent a0a9560258
commit d5894c0738
1 changed files with 7 additions and 0 deletions
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7
main.c
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@ -76,11 +76,18 @@ static REF_Mode ref_mode = REF_ModeNormal;
static void
do_platform_checks(void)
{
struct timespec ts;
/* Require at least 32-bit integers, two's complement representation and
the usual implementation of conversion of unsigned integers */
assert(sizeof (int) >= 4);
assert(-1 == ~0);
assert((int32_t)4294967295U == (int32_t)-1);
/* Require time_t and tv_nsec in timespec to be signed */
ts.tv_sec = -1;
ts.tv_nsec = -1;
assert(ts.tv_sec < 0 && ts.tv_nsec < 0);
}
/* ================================================== */